figure out to use clone_from

mock/src/transaction.rs

@@ -516,29 +516,4 @@ impl MockTransaction {
             v
         }
     }
-
-    /// Copy from other MockTransaction instance.
-    pub fn copy_from(&mut self, other: MockTransaction) -> &mut Self {
-        self.hash = other.hash;
-        self.nonce = other.nonce;
-        self.block_hash = other.block_hash;
-        self.block_number = other.block_number;
-        self.transaction_index = other.transaction_index;
-        self.from = other.from;
-        self.to = other.to;
-        self.value = other.value;
-        self.gas_price = other.gas_price;
-        self.gas = other.gas;
-        self.input = other.input;
-        self.v = other.v;
-        self.r = other.r;
-        self.s = other.s;
-        self.transaction_type = other.transaction_type;
-        self.access_list = other.access_list;
-        self.max_priority_fee_per_gas = other.max_priority_fee_per_gas;
-        self.max_fee_per_gas = other.max_fee_per_gas;
-        self.chain_id = other.chain_id;
-
-        self
-    }
 }

zkevm-circuits/src/evm_circuit/execution/begin_tx.rs

@@ -1808,7 +1808,7 @@ mod test {
                     .nonce(tx.nonce);
             },
             |mut txs, _accs| {
-                txs[0].copy_from(tx.clone());
+                txs[0].clone_from(tx);
             },
             |block, _tx| block.number(0xcafeu64),
         )